diff --git a/tests/test_variable_shadowing_fix.py b/tests/test_variable_shadowing_fix.py
index 399db1693..6a840f555 100644
--- a/tests/test_variable_shadowing_fix.py
+++ b/tests/test_variable_shadowing_fix.py
@@ -3,82 +3,97 @@
 import ast
 import sys
 
+
 def check_syntax(filepath):
     """Check if Python file has valid syntax"""
     try:
-        with open(filepath, 'r', encoding='utf-8') as f:
+        with open(filepath, encoding="utf-8") as f:
             code = f.read()
         ast.parse(code)
         return True, "Syntax OK"
     except SyntaxError as e:
         return False, f"Syntax Error: {e}"
 
+
 def check_no_shadowing(filepath):
     """Check that we fixed the variable shadowing issue"""
-    with open(filepath, 'r', encoding='utf-8') as f:
+    with open(filepath, encoding="utf-8") as f:
         content = f.read()
-    
+
     # Check that inner_app exists (our fix)
-    if 'async def inner_app(scope: Scope, receive: Receive, send: Send)' in content:
-        inner_app_count = content.count('async def inner_app(scope: Scope, receive: Receive, send: Send)')
+    if "async def inner_app(scope: Scope, receive: Receive, send: Send)" in content:
+        inner_app_count = content.count(
+            "async def inner_app(scope: Scope, receive: Receive, send: Send)"
+        )
         if inner_app_count >= 2:  # Should be in both functions
-            return True, f"✓ Found {inner_app_count} instances of 'inner_app' (expected 2)"
+            return (
+                True,
+                f"✓ Found {inner_app_count} instances of 'inner_app' (expected 2)",
+            )
         else:
             return False, f"✗ Found only {inner_app_count} instances of 'inner_app'"
     else:
         return False, "✗ 'inner_app' not found - fix not applied"
 
+
 def check_wrap_app_handling_exceptions(filepath):
     """Check that wrap_app_handling_exceptions uses inner_app not app"""
-    with open(filepath, 'r', encoding='utf-8') as f:
+    with open(filepath, encoding="utf-8") as f:
         content = f.read()
-    
+
     # Check request_response function
-    lines = content.split('\n')
+    lines = content.split("\n")
     found_request_response = False
     found_correct_usage = False
-    
+
     for i, line in enumerate(lines):
-        if 'def request_response(' in line:
+        if "def request_response(" in line:
             found_request_response = True
-        if found_request_response and 'await wrap_app_handling_exceptions(inner_app, request)' in line:
+        if (
+            found_request_response
+            and "await wrap_app_handling_exceptions(inner_app, request)" in line
+        ):
             found_correct_usage = True
             break
-    
+
     if not found_correct_usage:
-        return False, "✗ wrap_app_handling_exceptions still uses 'app' instead of 'inner_app'"
-    
+        return (
+            False,
+            "✗ wrap_app_handling_exceptions still uses 'app' instead of 'inner_app'",
+        )
+
     return True, "✓ wrap_app_handling_exceptions correctly uses 'inner_app'"
 
+
 if __name__ == "__main__":
     filepath = "fastapi/routing.py"
-    
+
     print("=" * 70)
     print("Verifying Variable Shadowing Fix in routing.py")
     print("=" * 70)
     print()
-    
+
     # Test 1: Syntax check
     print("1. Checking Python syntax...")
     success, message = check_syntax(filepath)
     print(f"   {message}")
     if not success:
         sys.exit(1)
-    
+
     # Test 2: Check inner_app exists
     print("\n2. Checking for 'inner_app' function...")
     success, message = check_no_shadowing(filepath)
     print(f"   {message}")
     if not success:
         sys.exit(1)
-    
+
     # Test 3: Check wrap_app_handling_exceptions usage
     print("\n3. Checking wrap_app_handling_exceptions usage...")
     success, message = check_wrap_app_handling_exceptions(filepath)
     print(f"   {message}")
     if not success:
         sys.exit(1)
-    
+
     print()
     print("=" * 70)
     print("✅ ALL CHECKS PASSED - Variable shadowing fix is correct!")